PREFACE» 
xvii 
V. Walter’s Herbarium. This interesting collection, 
from whicli Walter’s “ Flora Caroliniana” was 
compiled, is in possession of the Messrs. Frasers of 
Sloane Square^ whose father was the intimate friend of 
Mr. Walter. They very kindly permitted me to make 
use of it whenever I had occasion to refer to it. 
I am also highly indebted to William Roscoe, Esq., 
who very obligingly communicated to me Mr. Bradbury’s 
Plants collected in Upper Louisiana. This valuable 
collection contains many rare and new species, having 
been collected in a tract of country never explored be- 
fore : those which were entirely new I have described 
in the Supplement to the present work. 
Besides these general collections, there were a num- 
ber of interesting new plants in the Banksian Herbarium 
collected by different persons in North America. Among 
them I found a number of thpse collected by Archibald 
Menzies, Esq., during the famous expedition under 
Vancouver, on the north-west coast of America. As 
several of them had been described by me from the 
Lewisian collection, I requested permission of Mr. Men- 
zies to adopt such as were immediately connected with 
my plan, which he very obligingly complied with. 
The number of American plants in the different nur- 
series and private collections in the vicinity of London, 
contributed considerably to my resources, and I am 
highly indebted to those who gave me their assistance, 
particularly to Messrs. Lee and Kennedy, whose exten- 
sive collections exceed any other in Europe. 
The accounts I had frequently heard of the celebrated 
jSherardiau Herbarium at Oxford, made me particularly 
yoL. j. b 
